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Preheat oven to 375°F. Line baking sheets with parchment paper or spray them with nonstick cooking spray. In a food processor, pulse together the butter, eggs, sugar, lavender sugar, lemon juice and lemon zest. In a separate bowl, mix together flour, cream of tartar, dried lavender, salt and baking powder. Add the dry mixture to the creamed mixture and blend together to form a soft ball.
Form the dough into 1- inch round balls and press into discs, about 1-1/2 inches in diameter and 1/4 – inch thick. Arrange in a single layer on the prepared baking sheet and sprinkle over lavender sugar. Bake until light brown around the edges (approximately 10-15 minutes). Cool for 5 minutes then transfer to a wire rack and cool completely for another 15 minutes.